Overexuberance is a word that describes excessive enthusiasm, excitement or exuberance. Synonyms for this word can include "exaggerated excitement," "hyperactivity," "excessive zeal," "over-enthusiasm," or "excessive fervor." Other alternatives for overexuberance might be "recklessness," "excessiveness," "overdriven," or "overearnestness." These words can all be used to describe someone who is enthusiastic to an extreme degree, to the point where it might not be healthy or appropriate. While it can be positive to be excited about things, overexuberance can also be seen as a negative trait that needs to be toned down in order to maintain balance and perspective.